Chaeles lambeety



(No Model.)

C. LAMBERTY..

BURGLAR ALARM.

No. 357,837. Patented Feb. 15, 1887,

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UNITED STATES PATENT OFFICE,

CHARLES LAMBERTY, OF BROOKLYN, NEXV YORK.

BURGLAR-ALARM.

SPECIFICATION forming part of Letters Patent No. 357,837, dated February15,1887.

Application filed August 12, 1886.

the spindle of a door, so that when the knob.

is turned by any one desiring to enter the room the alarm" is set inoperation.

.times in a perpendicular position.

which carries the weight.

The invention consists, principally, in suspending a weight or pendulumwithin the case of the apparatus, which tends to remain at all Thealarmtrain is operated by a spring. When wound and secured to thedoor-spindle, it is kept from running down by a pin upon the scapewheel, which engages a pin upon the rod As soon as the knob is turnedthe Weight and its rod change their positions, the scape-wheel isreleased, and the alarm is sounded. \Vhen once started, a deviceprevents it from being stopped by any movement of the knob; but itcontinues until'the spring is unwound or until some one on the same sideof the door as the alarm arrests it.

In the accompanying drawings, whichillustrate my invention, Figure l isa front view of the alarm suspended from the spindle of the door. Fig. 2is a back view showing the arrangement of the train and weight, and Fig.3 is a 'side view of the same.

Referring to the drawings, A represents the door-knob; a, the spindle;B, the gong; O, the case of the alarm, D, the principal wheel of thealarm-train, and s the scape-wheel. At the top of the case of the alarmthearm m is rigidly fixed, and m is pivoted thereto at n. These arms aremade to clasp tightly the spindle of the door-knob by means of thethumbscrew t and the screwrod 0*, which latter passes through at, and ispivoted to m at m.

, When the alarm is suspended, it hangs in an approximatelyperpendicular shown in the drawings. freely suspended upon the rod w atthe point e. The armF is fixed to the rod to at right angles thereto.Upon the scape-wheel s are position, as

The weight W is Serial No. 210,708. (No model.)

one or more pins, 1). When both the case C of the alarm and the rod toare in a perpendicular position, the pin p upon the end of the arm F isin the path of the pins 9, and will engage one of them; but if the caseand the rod 20 change their relative positions by the movement of theweight XV toward either side the pin 12 is carried either above or belowthe pin p, and the scape-wheel is released. The spring S is wound byapplying a key to the spindle k in the usual manner, It being theusualretaining-pawl. Visthevibrating-leverescapement.

It is evident that when the door-knob is turned the case of the alarm,being rigidly attached to the spindle a, is turned with it; but theweight W, being freely suspended from the 'point 6, will preserve itsperpendicular position, and will turn the arm F, thus releasing thescape-wheels. At the point o, where the vibrating lever V is pivoted,the rod 1) is rigidly attached to V, and the hammer H of the gong iscaused to vibrate as V is vibrated by the rotation of the scape-wheel s.The hammer H is within the gong B, and strikes the latter with eachmovement, causing, when the scape-wheel is in motion, a rapid successionof strokes.

An arm, R, is loosely pivoted upon the screw '80 r and extends acrossthe case, the end 1'' passing outthrough an opening at o. The armR hasnear its center the slot 3/, and a pin, 1)", upon the rod w slideswithin the slot 3 Then the rod to is in a. perpendicular position, thepin 19 is in the position shown-that is, at the bottom of the slot-butif the weight Wmoves toward either side the pin 19 slides toward one ofthe points 3/ or 3 Any slight movement of the weight WV is sufficient tocarry the pin 0 10 into one or the other of these positions, and

when it reaches either it is at once held in that position, as the shapeof the slot at the ends will not permit it to return, so that when f hasonce reached the point y or y the scape'wheel 5 is free to revolve untilthe spring is run down.

If the knob is turned back to its former position, so that the case ofthe alarm is again ina perpendicular position, theweight XV is simplyheld out of its perpendicular position so long as thepin p is held atyor 9*. It will be seen that when the pin p moves either way within theslotg the armR will be pushed downward, and when p is at y or y the endof the arm R will be about at the bottom of the opening 0 in the side ofthe case. By raising the nd 1" of the arm R the pin 1) may be releasedfrom y or 1 and brought into its middle position at the bottom of theslot, as shown in the drawings. This brings the pinp upon the arm F intothe path of thepinp upon the scapewheel and the alarm is stopped;

When the alarm is fixed ready for operation, the arm R is in theposition in the middle of the opening 0, as shown. When it is desired tolock the alarm so that turning the knob will not cause it to operate,the end 1" of the arm R is lifted to the top of the opening 0, and isheld there by the catch is. In that position the weight is rigidly heldin position and the door can be opened without affecting the alarm.

I claimas my invention 1. The combination, in a burglar-alarm, of armsattached to the case of the alarm for clasping the spindle of adoor-knob, a weight or pendulum supended from said case, a train ofwheels and a gong, a spring for actuating the same, and a deviceconnected with said pendulum for normally locking said train and forreleasing the same when the weight is moved.

2. In a burglar-alarm, the combination of arms for clasping the spindleofa door-knob, which are rigidly attached to the case of the alarm, atrain of wheels and a gong, a spring for actuating the same, a suspendedweight or pendulum, a device connected with said pendulum for causingthe alarm-train to be set in operation when said pendulum moves from aperpendicular position, and a device for preventing the return of saidweight to a perpendicular position after it has left the same.

3. The combination, in a burglar-alarm, of arms for olasping the spindleof a door-knob, a train of wheels and agong, a spring for actuating thesame, a suspended weight or pendulum, a device connected with saidpendulum for causing the alarm to be set in operation when said pendulummoves from a perpendicular position, and the arm R, with device forengaging the pendulum-rod, whereby the return of said Weight to aperpendicular position is prevented after it has left the same, andwhereby the action of said alarm may be manually arrested.

4. The combination, substantially as hereinbefore set forth, of thealarm-case O, the arms at and m, and the screw-rod "r, and thumb screwit, for attaching the alarm to the spindle of doorknob, the suspendedweight \V, the train of wheels, the gong, the arm F, carrying the pin19, for engaging a stop upon the scape'wheel, and the arm R, having theV- shaped slot for engaging the pin 10 upon the pendulum-rod, which saidarm R extends out side the case of the alarm.

-In testimony whereof I have hereunto subscribed my name this 10th dayof August, A. D. 1886.

CHARLES LAMBERTY.

\Vitnesses:

Gno. M. PHELPs, Ji'z, CHARLES A. TERRY.

